Luteinizing Hormone (LH)

Luteinizing hormone (LH) is produced by the pituitary gland. In women, LH helps regulate the menstrual cycle and egg production (ovulation); in men, LH stimulates the production of testosterone, which plays a role in sperm production.

Women's LH levels normally vary with the phase of the menstrual cycle, rapidly increasing just before ovulation occurs. This "LH surge" is a dependable sign that a woman is in a fertile time of her cycle. Men's LH levels normally remain constant.

Abnormally high or low LH levels can be a sign of an inability to produce eggs or sperm.

By

Healthwise Staff

Primary Medical Reviewer

Sarah Marshall, MD - Family Medicine

Specialist Medical Reviewer

Kirtly Jones, MD - Obstetrics and Gynecology

Last Revised

June 8, 2012

eMedicineHealth Medical Reference from Healthwise

This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.